Machine for making paper boxes



, Aug. 31, 1926. 1,597,681

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Filed August 8,

1923 16 sheets-sheet 1e lizvenloz? ezgywlmau Patented Aug. 31, 1926.

STATES earsur OFFICE.

HENRY A. GUSTAFSON, DORCHESTE'R, MASSACHUSETTS, ASSIGNOR 10 PNEUMATIC SCALE CORPORATEON LIMITED, OF NORFOLK DOVNSLl/ASSACHUSETTS, A COR- PORATEON OF MASSACHUSETTS.

MACHINE FOR MAKING PAPER BXES.

Application filed. August 8, 1923. Serial No. 656,374.

rllhis invention relates to machines for making paper boxes, and particularly to a machine of the type disclosed in the patent.

trated in the accompanying specification andv drawings and particularly pointed out in the appended claims.

One characteristic feature of my invention consists in an automatic safety mechanisni controlled by the feed of the box blanks and automatically effective upon failure of such feed to prevent the pressure roll for the banding strip from pressing the strip against the box thereby preventing feed of the strip.

Heretofore, `in machines of this type, whenever there was a failure of box blank feed, the presser roll operated and the sev# ered length of adhesively coated banding strip was pressed against and adhered to the box blank holder itself and was Wrapped around said holder when the holder began to revolve, necessitating stopping the machine until the strip could'be picked off the holder. lf thefailure of the box blank feed was not immediately noticed and the guninied strip removed from the holder, the physical presence of this strip Wrapped about the holder prevented the entrance of succeeding` box blanks into the holder, causing the machine to jam. According to iny-v invention, overcome this defect by the use of a box blank detector disposed in the path of feed of the boX blanks for actuation by each blank as itis fed,such actuation removing a normally applied latch for the strip presser roll and permitting said roll to function. box blank feed, the detector is not actuated and consequently the latching mechanism for the presser roll remains applied so that said roll will not function.

lhenever there is a failure ofV Another feature of my invention consists. in an automatic clutch mechanism controlling the feed of the banding strip, whereby the strip feed Will be automatically disconi tinued Whenever slack develops in the strip and will be automatically resumed When the slack is taken up. l

Heretofcre, Whenever slack developed in the lbanding` strip, the strip wwould become entangled and broken unless the operative reduced the speed of the strip feed until the slack was taken up. lf then, the operative did not again adjust the speed of the feed, the pull of the box on the strip Was apt to break the strip. This necessitated constantly changing the speed of the strip feed. My

invention avoids this defect by automatically stopping the strip feed Whenever slack Vdevelops and will be-automatically resumed when the slack is taken-up.

A. further feature of my invention consists in the shear mechanism Which lsevers from the banding strip a length sufficient to encircle the particular size of box being banded. Heretofore, in machines of this type, one shear blade Was stationaryand the other moved past it to cut the strip. Such cutting action, however, ldistorted the strip out of its plane of travel, particularly Where 'the point of action of the blades on the strip was distantlyremoved fromV the plane of travel of the strip, as With large-sized bones. l overcome'this objection by arrang-V ing both shear blades for simultaneous opposite movement in adjacent parallel planes,

with capacity for adjustment for varying of the bladeswill always be at the plane of the strip and hence the strip Will. be'severed Without distortion from its plane of travel.

These,I and certain other features of advantage Which Will appear more particularly hereinafter, are secured in the machine of the present, invention. las illustrative of the principlesinvolved, l shall shovv` and dcscribe a form of machine Which has been found satisfactory in actual use and Well adapted to the requirements of manufacture. Throughout the acccmpanying specification and dravvings'like reference characters are sizes of boxes, so that the Ipoint of overlap se j vshowing the automatic correspondingly applied and in the drawings:

Fig. 1 is a front elevation of a paper box making inacliinein accordance with my invention.

Fig. 2 is a side elevation of the machine as viewed `fromtheright of Fig. 1.

i Fig. Sis a side elevation as viewed from the left of Fig. 1. Y

Fig. 4 is a plan view of the machine with super-structure broken away..

Fig. ifL is a plan view of the banding strip feed. v f

Fig. 4b is a plan view of the box blank feed.'r

Fig. /1c is a fragmentary .plan view of the automatic safety device for preventing operation of the banding strip presser roll v'whenever there is a failure of box blank erating mechanism for the box kblank holder,

the strip shears, the front and back folders, and the laterally sliding matrix. Fig. is an enlarged elevation part-ly in section,of the machine as viewed in Fig. 2 and Aparticularly showing the shear mechanisin.

Fig. 6 is a similar view from the opposite side, as in Fig. 3. u e

Fig. 7 is a Afragmentary section of the box blank feed mechanism, particularly safety mechanism controlled by the feed of the box blanks.

F ig. 7a is a view similar toFig. 7 and Yshowing a further position of said parts.

Figs. 8 and 8a are detail views of the mutilated gear Afor revolving thebox holder to lay the banding tape about the box, Fig. 8 showing Athe inoperative and Fig. 8"L the operative position of the parts.

F ig.9 .is la view similar to Fig. 7a and showingthe position of the box `blank when automatic safety the parts 'are in the position of Fig. 8a.

F igs. 10and 11 are detail views vof the device for preventing operation of the strip pressure roll upon failure of thebox blank feed, Fig. 10 showing the safety device applied to preventopera-l tion of the presser roll,'and Fig. 11 showing'V it released by the feed of a box blank to permit operation of said roll.

Fig. 12 is a section on the line ofA Fig. 4 with the box holding form omitted to show the parts whichlie behind it.

Figs. 13 and 18'D1 are enlarged detail views of the front folder slideshown` in Fig. 12 and'ofthe folders carried by said slide, Fig. l13, illustrating the` folding Vdown of one pair of opposite. side folds and Fig. 13a

pair ofopposite side folds. i

igs. 14= and 15 arefragmentary stripped views particularly 'showing the gravitating tension device which actuates the automatic clutch mechanism for the banding strip feed whenever a slack condition exists vin the strips, Fig. 14 showing the operative and Fig. 15 the inoperative position of said tension device.

Fig. 15a is a view illustrating the action box bottoni.

Figs. 18, 1.8 and 18" are diagrams illustrating the setting of the back extensions of the strip, which have been folded as illustrated in Fig. 17, firmly against Ythe vbottom of the box and also showing the release 0f the box from the box holding plunger to permit the laterally sliding matrix to set over the box transversely into line with the front/fold setting plunger.

Figs. 19, 19EL and 19b are diagrams illustrating the folding down of the front extensions of the strip, Fig. 19b also illustrating the partial ejection of the blank from the matrix to permit the side walls of the box to be set.

Figs. 2O and 20a illustrate such setting of the box walls, Fig. 2Oa also illustrating the ejection of the completed box from the matrix and 1 Y .Fig-s. 21 and 22 are detail views of the clutch forming a part of the banding strip safety feed mechanism, Fig. 22 being a sectionon the line'22-22 of Fig. 21. Y

General.

Ina machinek of the type shown herein the boxblanks are of rectangular forni and are stackededgewise in a magazine from which they are ejected singly and passed to box holder where their notched flaps are turned inwardly to-form. the four sides of the box, the main body .portion of the blank forming the bottom ofthe box. One or more lengths of banding strip is then laid around the corners ofthe box in a complete turn, the box being yrotated relative to the strip until the banding has been substantially completely wound around the box after which it is severedr from the strip, and the box holder is then advanced axially towards a holder and set overlaterally into line with a fold setting plunger and during such set over theinside or front extensions ofthe banding strip are turned over kat right angles to the flaps of the box. When the box reaches alinement with the fold setting plunger said folds are sealed down to the inside faces of the box flaps. The box is then compressed to set it to shape and afterwards ejected from the machine.

Blcmlc box magasine.

The. properly shaped and scored box blanks B are stacked edgewise in a magazine 1 (Fig. 4b) slidable on the table 2 of the head of the machine. The magazine is advanced a uniform distance linearly, by any suitable feed mechanism, as the box blanks are sing'ly removed therefrom. As here shown, the magazine is advanced progressively by a tension feed mechanism comprising a pair of chains 3 anchored at 4 to the table 2 and passing over the sprockets b mounted upon a sprocket shaft at the forward end of the magazine. From said sprockets, the chains are extended rearward ly above the magazine past guide sprockets 6 at the rear end of said table, being weighted at their free ends, as indicated at 7, Fig. 2. The magazine is adapted to be latched in its rearward position by a spring-ten sioned latch 8, (Fig. 4b).

Box blank feeol mechanism.

As the foremost blank in the stack of blanks contained in the magazine 1 is projected beyond the forward edge of the table 2, it is engaged by a vertically reciprocable feed plunger 9, Figs. 7 and 7a, and carried downwardly past opposite pairs of spaced feed rolls 10 into a holder 11 disposed in line with the plunger and carried by a bracket 12. The blank feed rolls 10 are rotated in opposite directions from a drive shaft 13, (Fig. 4) which is driven by a sprocket and chain 14 from the power shaft 15 of they machine, Fig. 3. The drive shaft 13 is geared at 16 to the front roll shaft 17 and said shaft is geared at 18 to the rear roll shaft 19 whereby the pairs of rolls 10 Vare rotated in unison, 4C).

rlhrough a gear train 22 the power shaft 15 drives a cam shaft 23 at the back of the machine and a cam shaft 24 at the front of the machine (Fig. 4d). Fast to the cam shaft 23 is an eccentric 25 which is connected by a rod 26 with a bell crank lever 27 (Fig. 7?). The lever 27 is connected by a rod 28 with a toggle lever 29 and said lever 29 is connected by a link 30 with the slide 9 which feeds the box blanks from the magazine 1 to the box holder 11.

The holder 11v is apertured to permit a 1 longitudinally disposed plunger 2()` to slide therethrough and at one side of said aperture is provided with a plurality of horizontally disposed spring fingers 21 by means of .which the flaps B forming the walls of the .retreat of the plunger.

vthe machine.

vbox are turned up on advance of said The plunger 2O is both rotatable and axially slidable relative to the holder 11, being mounted within a sleeve 20. Splined at 31 to said sleeve is a pinion 32 (Figs. 7 a and 8a) adapted to mesh with a mutilated gear 33 on the cam shaft 23. The gear 33 is provided beyond its toothed portion and adjacent its periphery vwith a pin 34.v Splined to the plunger sleeve 20 is a disc 35, the periphery of which is segmentally recessed as indicated at 36, Figs. 3, 3 and 8a, to permit the smooth portion of the constantly revolving mutilated gear 33 to pass said disc without Vrevolving it.

Fast to said disc at one side thereof, is a dog 37 adapted to be contacted by the pin 34 on the mutilated gear 33 at the proper moment. Such contact raises the dog, as shown in Fig. 8a, revolving the disc counter clockwise sufficiently to insure accurate meshing of the pinion 32 which is fast on the opposite face of the disc, with the toothed portion of the mutilated gear. rlhe plunger 20 will now be rotated through a complete revolution whereby the banding tape will be laid around the box in a complete turn. f

lThe plunger 2O is advanced axially by a cam 37 on the cam shaft 23. This cam is a Vclosed cam and has a cam path generated therein to'control the'advance, pause, and

cam 37 is transmitted to the plunger by a cam lever 38 havinga cam roll 39 operating in the cam path. The upper end of the cam lever is connected to the plunger in any suitable manner, as indicated at 40, Fig. 7 a.

Bending strip feecl.

rllhe banding strip S is carried upon a supply roll 41 depending from the frame of colored strips, or a linen and a paper strip, for example, may be simultaneously fed. For convenience of description, however, it

will be assumed that only one strip roll is in operation. p

The strip drawn by a feed pulley 46 fromthe supply roll 41 through a tension device 42 past a pair of glue rolls 43 operating in a glue pan 44 and througha second tension. device From thepulley 1 46, the strip is passed around a gravityv roll The actuation of the As shown in Fig. 14, two supply rolls 41 are provided so that diderently In its passage through the tension device 49, the strip is positively fed forward by means of a feed finger 51 which is rocked at each cycle of the machine by a cam 52 mounted on the cam shaft 24 (Fig. 2) and connected by cam lever 53 and rod 54 with said feed finger.

The banding strip feed pulley 46 is fast on a shaft 55 which is constantly driven by a sprocket 56 thereon, a chain 57, and a sprocket 58 on a counter shaft 59 (Fig. 4a). The shaft 59 is driven bya Yvariable speed drive 'consisting of a friction disc 60 on said shaft and a friction cone 61 adjustable by a feed mechanism G2 radially of vsaid disc. The' cone 61 is mounted on a shaft 63 which is geared at to a cross shaft 65 driven by a sprocket and chain drive 66 (Fig. 4) from the cam shaft 24.

member 67 carries onjits inner face-a spring i backed kdog 70` which is provided with a shoulder 71. 'i

Normally, when the banding strip is taut,

as in Fig. 14, the shoulder 71 rides on the shoulder 69, and the clutch. member 67 drives the'pulley [shaft 55. develops in the strip, however, the gravity roll 47 will kContact a pair of levers 72 ful-- crumed on a horizontal rock shaft73 and rock said shaft, as shown in Fig. 15and the rocking motion of said shaft is transmitted tnrough an arm 74 fast on said shaft 73 and connected by a: rod 75 with al vertical rock shaft 7 6 to a stop arm 77 on the upper end ofthe shaft 7G. Upon actuation of the levers 72, therefore, the stop arm 77 will be'rocked into the path of the clutch dog 70 of the clutch member 67 and the contact of said arm and dog will force the dog downwardly, against the tension of'its backing spring', whereb-y to carry thel shoulder 71 'oli' the shoulder 69thereby disconnecting the clutch parts 67 Vand 68. Further rotation olf-'the clutehmember 68 is pre-` vented bythe contact of a stop lug'78 on the face'of the clutch member 68 with the stop arm 77. v

The feed of the banding strip is therefore discontinued until the slack is taken up, at

'which time Vthe gravity-roll47 `will be lifted,

l/hen slack by the banding strip, away from the levers 72, permitting` a counterweight 79 associated Vwith said levers to return the parts to their normal position shown in Fig. 14.

Presser roll safety mechanism.

`81 and atits rear end is spring tensioned as indicated at 82 12). The rock shaft 81 has an arm 83 depending therefrom and connected by a latch bar 97 to acam lever S4'operated from a cam 85 on the cam shaft 24 whereby, in the normal operation ofthe machine, the presser roll is raised towards the box holder at each cycle of the machine. In such operation, each box blank as it is fed between the rolls 19 encountersa detector finger Spivoted on a rock shaft 87 and under-the control of a spring 88 so that the detector finger vill ncrmaly lie in the path of the boX blanks feeding` between said rolls, (Fig. 10).

Fach box blank as it is fed between the rolls 10 swings the detector finger into the position of Fig. ,11, and such movement of the linger is utilized to remove a latch VmechanismV for the strip presser vroll 50 whereby to lpermit said roll to function. To

this end, the rock shaft `87 of the -detector,

" position of Fig. 10, tovlie under and infcon- 'act with thelug 96 on the under face of the latch bar 97, which is connected by the rocker arm 83Jvith the rock the lpresser roll.

llien the detector linger is actuated by a descending box blank, as shown in 'Fig'. 11,

shaft 8l for the latch dog 95 is removed from beneath the 'lug 96 on the latch bar 97, permitting the cam lever84 to raise the presser roll.

The oaeration of theV lever 841s subiect to a pawl and ratchet locking mechanism comprising a: ratchet arm 498 carried by theA rock shaft v81 and -a spring tensioned pawl 99 pivoted at 100.' Normally the pawl and ratchet are in engagement to prevent operation of the presser roll,`but this engagement is released at the proper:moment by a pin 191 'on one of the [castings in'y which the v'rock vshatt 81. is ,journaledand adapted to 'contact the pawl tocarry it away from the ratchet teeth, whereby thelever 8Ov may be swung upwardly. Afterv the boX blank has 

